Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed40f3d58e7e14ad…

MALICIOUS

PDF

92.8 KB Created: 2021-07-04 18:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8a52fa4b8d88b4c1a4b6a045f1eb02a6 SHA-1: d9020a68d8274928d4b1f36328f5af384208be98 SHA-256: ed40f3d58e7e14ade5792e7a6aa50fbc43b72695ed2ef6309cf3f96aa6294e1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised or disposable domains, indicating a link farm or phishing lure. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier also flagged the PDF with high confidence, aligning with the ClamAV detection of 'Pdf.Phishing.Trojan'. No scripts were extracted, but the structure and URL distribution are indicative of a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://m-astar.com/UserFiles/files/14115681387.pdf In PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609accd5950de---jomebeno.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/q66aolremi3i0hgfhjfklqk461/kitafutomewup.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/vebanodoruluziduweg.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1378499a69---numosujexopibopefesi.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/3edfc8354b9d957622127263bf1c3b1f/63453157069.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe953122dc---nizozogurap.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608720f371d4e---kimezidimepifal.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087630a51474---7393336604.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085191e954e3---wubakodukidatiwatax.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/795799627.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/25956555038.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608806eb01829---77144105784.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/916utj52q2p6ihhim3qnub3sg1/20783217200.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e835e249c6---nowaruxunepezetabazovi.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/gosogegewuxewex.pdfIn PDF document text
    • https://ebooksweb.net/files/file/61971758726.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/32239471638.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085faec0d463---47105091492.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/bnv9u2jtafooppb0sfluu9nn50/busebetemewigabokeg.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8b8da2c14---87103607936.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/22936985495.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940ab879ea9---wibogoxolajaj.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/85730793199.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=microfinance+and+financial+inclusion+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001064f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064F 10608 bytes
SHA-256: 4a13dcd53c3ad41c8ac73d86a5da97bc8743bce29c8b71cf2a87b9c49c37a00e
font_01_sfnt_off00011ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B7 17948 bytes
SHA-256: d9f971a93d564e2ac3fd6ce5f77f0e9f707f39db5557b0008136ccef4e05e317

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